Method and System for Calibrating Streamer Electrodes in a Marine Electromagnetic Survey System

(19)

(11)

EP 2 230 535 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	23.11.2011 Bulletin 2011/47

(43)	Date of publication A2:
	22.09.2010 Bulletin 2010/38

(21)	Application number: 10155085.3

(22)	Date of filing: 01.03.2010

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International Patent Classification (IPC):

G01V 3/12^(2006.01)

G01V 13/00^(2006.01)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

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Priority:

16.03.2009 US 381689

(71)	Applicant: PGS Geophysical AS
	1366 Lysaker (NO)

(72)	Inventor:
	Lindqvist, Ulf Peter 141 72, Segeltorp (SE)

(74)	Representative: Skone James, Robert Edmund
	Gill Jennings & Every LLP The Broadgate Tower 20 Primrose Street London EC2A 2ES London EC2A 2ES (GB)

(54)	Method and System for Calibrating Streamer Electrodes in a Marine Electromagnetic Survey System

(57) A marine electromagnetic sensor system includes a sensor cable (10) having at least one electromagnetic sensor (12) thereon. A first calibration electrode (13A) is disposed on the cable on one side of the sensor. A second calibration electrode (13B) is disposed on the cable on an opposite side of the sensor. A calibration power supply (15) is coupled to the first and second calibration electrodes. A measuring circuit is coupled to the sensor. A method for calibrating marine electromagnetic survey electrodes includes imparting electric current between calibration electrodes disposed at spaced apart locations on a cable deployed in the water. Voltages impressed across a pair of electrodes disposed on the cable between the calibration electrodes are detected in response to the current. A change in sensitivity of the at least one pair of electrodes is determined using the detected voltages.

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